Question

我有两个表在不同的数据库中具有相同的列。两个表都有记录。我想在table1中插入table2的记录，但我想忽略那些已经在表1中的记录。我还想将所有被忽略的记录存储在一个新表中。例如：

create table dest 
(id number primary key,
 col1 varchar2(10));

create table src
(id number,
 col1 varchar2(10));

insert into src values(1,'ABC');
insert into src values(2,'GHB');
insert into src values(3,'DUP');
insert into src values(3,'DUP');

commit;

merge into dest 
  using 
  (select id,col1 from src) src on(dest.id=src.id)
when not matched then 
  insert values(src.id,src.col1)
when matched 
  then update set dest.col1=src.col1;

错误报告 - SQL错误：ORA-00001：违反了唯一约束（SCOTT.SYS_C0010807） 00001. 00000 - “违反了唯一约束（％s。％s）” *原因：UPDATE或INSERT语句尝试插入重复键。对于在DBMS MAC模式下配置的Trusted Oracle，您可能会看到如果重复条目存在于不同级别，则显示此消息。 *操作：删除唯一限制或不插入密钥。

Answer 1

您可以使用intersect和minus来确定差异

-- Test Data

-- table1@abc  
with data1(id,
val) as 
 (select 1, 'val1'
    from dual
  union all
  select 2, 'val2'
    from dual
  union all
  select 3, 'val3'
    from dual),

-- table2@xyz  
data2(id,
val) as 
 (select 1, 'another val1'
    from dual
  union all
  select 2, 'val2'
    from dual
  union all
  select 4, 'val4'
    from dual)

-- Intersection
select 'Intersection', intersection.*
  from ((select * from data2) intersect (select * from data1)) intersection

union all

-- data2 not in data1
select 'data2 not in data1', d2.*
  from ((select * from data2) minus (select * from data1)) d2

union all

-- data1 not in data2
select 'data1 not in datad', d1.*
  from ((select * from data1) minus (select * from data2)) d1;

将行从一个表复制到另一个表，忽略远程重复项

1 个答案: